Browse WFS layers

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
// Copyright 2019 Esri.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
// You may obtain a copy of the License at: http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific
// language governing permissions and limitations under the License.

using Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Ogc;
using Esri.ArcGISRuntime.Symbology;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Threading.Tasks;
using System.Windows;

namespace ArcGIS.WPF.Samples.BrowseWfsLayers
{
    [ArcGIS.Samples.Shared.Attributes.Sample(
        name: "Browse WFS layers",
        category: "Layers",
        description: "Browse a WFS service for layers and add them to the map.",
        instructions: "A list of layers in the WFS service will be shown. Select a layer to display.",
        tags: new[] { "OGC", "WFS", "browse", "catalog", "feature", "layers", "service", "web" })]
    public partial class BrowseWfsLayers
    {
        // URL to the WFS service.
        private const string ServiceUrl = "https://dservices2.arcgis.com/ZQgQTuoyBrtmoGdP/arcgis/services/Seattle_Downtown_Features/WFSServer?service=wfs&request=getcapabilities";

        public BrowseWfsLayers()
        {
            InitializeComponent();
            Initialize();
        }

        private void Initialize()
        {
            // Update the UI.
            ServiceTextBox.Text = ServiceUrl;

            // Create the map with imagery basemap.
            MyMapView.Map = new Map(BasemapStyle.ArcGISImageryStandard);

            _ = LoadService();
        }

        private async Task LoadService()
        {
            try
            {
                LoadingProgressBar.Visibility = Visibility.Visible;
                LoadLayersButton.IsEnabled = false;
                LoadServiceButton.IsEnabled = false;

                // Create the WFS service.
                WfsService service = new WfsService(new Uri(ServiceTextBox.Text));

                // Load the WFS service.
                await service.LoadAsync();

                // Get the service metadata.
                WfsServiceInfo serviceInfo = service.ServiceInfo;

                // Get a reversed list of available layers.
                IEnumerable<WfsLayerInfo> layerListReversed = serviceInfo.LayerInfos.Reverse();

                // Show the layers in the UI.
                WfsLayerList.ItemsSource = layerListReversed;
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex);
                MessageBox.Show(ex.Message, "Error loading service");
            }
            finally
            {
                // Update the UI.
                LoadingProgressBar.Visibility = Visibility.Collapsed;
                LoadLayersButton.IsEnabled = true;
                LoadServiceButton.IsEnabled = true;
            }
        }

        private async void LoadLayers_Clicked(object sender, RoutedEventArgs e)
        {
            // Skip if nothing selected.
            if (WfsLayerList.SelectedItems.Count < 1)
            {
                return;
            }

            // Show the progress bar.
            LoadingProgressBar.Visibility = Visibility.Visible;

            // Clear the existing layers.
            MyMapView.Map.OperationalLayers.Clear();

            try
            {
                // Get the selected WFS layer.
                WfsLayerInfo selectedLayerInfo = (WfsLayerInfo)WfsLayerList.SelectedItems[0];

                // Create the WFS feature table.
                WfsFeatureTable table = new WfsFeatureTable(selectedLayerInfo);

                // Set the feature request mode to manual - only manual is supported at v100.5.
                // In this mode, you must manually populate the table - panning and zooming won't request features automatically.
                table.FeatureRequestMode = FeatureRequestMode.ManualCache;

                // Set the axis order based on the UI.
                if (AxisOrderSwapCheckbox.IsChecked == true)
                {
                    table.AxisOrder = OgcAxisOrder.Swap;
                }
                else
                {
                    table.AxisOrder = OgcAxisOrder.NoSwap;
                }

                // Populate the WFS table.
                await table.PopulateFromServiceAsync(new QueryParameters(), false, null);

                // Create a feature layer from the WFS table.
                FeatureLayer wfsFeatureLayer = new FeatureLayer(table);

                // Choose a renderer for the layer based on the table.
                wfsFeatureLayer.Renderer = GetRendererForTable(table) ?? wfsFeatureLayer.Renderer;

                // Add the layer to the map.
                MyMapView.Map.OperationalLayers.Add(wfsFeatureLayer);

                // Zoom to the extent of the selected layer.
                await MyMapView.SetViewpointGeometryAsync(selectedLayerInfo.Extent, 50);
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex);
                MessageBox.Show(ex.Message, "Error loading service");
            }
            finally
            {
                // Hide the progress bar.
                LoadingProgressBar.Visibility = Visibility.Collapsed;
            }
        }

        private Renderer GetRendererForTable(FeatureTable table)
        {
            switch (table.GeometryType)
            {
                case GeometryType.Point:
                case GeometryType.Multipoint:
                    return new SimpleRenderer(new SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Circle, Color.Blue, 4));

                case GeometryType.Polygon:
                case GeometryType.Envelope:
                    return new SimpleRenderer(new SimpleFillSymbol(SimpleFillSymbolStyle.Solid, Color.Blue, null));

                case GeometryType.Polyline:
                    return new SimpleRenderer(new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.Blue, 1));
            }

            return null;
        }

        private void LoadServiceButton_Click(object sender, RoutedEventArgs e)
        {
            _ = LoadService();
        }
    }
}